Answer:
The answer is B. 600
Step-by-step explanation:
Hope that helps!
Answer:the second one
Step-by-step explanation:i Hope you get it right
Here are the Three Main Economic Questions
1) Who consumes the goods and services produced in society?
2) What goods and services must be produced in society?
3) How should goods and services be produced in society?
These questions are very important because it deals on how available resources are allocated to produce essential goods and services demanded by consumers.
Answer:
A) (2,20)
B) Yes, Because the line passes through the origin (0,0)
C.) In 10 hours, the cost of electricity is $100
D.) y=10x
Answer: the rate at which Jerri runs on level ground is 6 mph
Step-by-step explanation:
Let x represent the rate at which Jerri runs on level ground.
Jerri figures that she runs 2 miles per hour faster downhill than she runs on level ground. This means that the speed at which she runs downhill is (x + 2) mph
Time = distance/ speed
Four miles of the course is downhill. This means that the time it takes her to run downhill is
4/(x + 2)
Whereas the other 3 miles is on level ground. This means that the time it takes her to run on level ground is
3/x
Jerri jogs 1 hour each day over the same 7-mile course. This means that
4/(x + 2) + 3/x = 1
Cross multiplying by x(x + 2), it becomes
4x + 3(x + 2) = x(x + 2)
4x + 3x + 6 = x² + 2x
x² + 2x - 4x - 3x - 6 = 0
x² - 5x - 6 = 0
x² + x - 6x - 6 = 0
x(x + 1) - 6(x + 1) = 0
x - 6 = 0 or x + 1 = 0
x = 6 or x = - 1
Since the speed cannot be negative, then x = 6 mph